I just bought a 2004 Chevrolet Malibu and when I am idling at a stop light about 40% of the time, the car will just accelerate on its own. I have to often put it in neutral to keep it from going forward. What should I expect the problem to be?

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The next time it starts shaking and acting up its the time to have a fuel pressure test, or maybe if you can't remember the last time the fuel filter been chg. do that and see if it dosent run any better. Could be filter getting cloged up, or maybe pump getting weak and dosent show up until its run a while and has got warm.

your alternator is likely on its way out. you should take your car to a trusted mechanics shop and have the charging system tested.Its only a matter of time until the alternator stops charging and you'll be stranded on the side of the roadHope this helps..........Good Luck!

I have an 04 Malibu and when I get hard starts when I'm in the car I just press the accelerator down about half way and it always starts right up, some times I have to hold the accelerator down a little after starting to stop it from stalling but it is rare.